Why Dry Weather Affects Your Rain Gauge
After an extended period of dry weather, your rain gauge can accumulate dust, pollen, cobwebs and debris that settle inside the funnel and measuring chamber. When the rain finally returns, this build-up can block the tipping mechanism, clog the funnel, or cause inaccurate readings — meaning you could miss the very rainfall data you've been waiting for.
A little maintenance now will ensure your gauge is ready to capture accurate data the moment the first drops fall.
Step-by-Step Rain Gauge Maintenance
1. Inspect the Funnel and Collection Area
Remove the top section of your rain gauge and carefully inspect the funnel for any blockages. Dry weather often brings dust and airborne particles that can settle and harden inside the funnel. Look for cobwebs, leaves, and insect nests that may have taken up residence during the quiet period.
If your funnel is cracked, discoloured, or damaged from UV exposure, it's worth replacing it to ensure accurate collection. We stock a range of replacement funnels:
- Rain Gauge Funnel for Ecowitt WH40 & Others — a direct replacement funnel compatible with the popular Ecowitt WH40 and other models.
- Rain Gauge Collection Funnel (Small) — suitable for smaller gauge housings (check the description for compatibility).
- Rain Gauge Collection Funnel (Medium) — for medium-sized gauge housings.
- Heightened Rain Funnel with Bird Spikes for WH40 & Others — an upgraded funnel with built-in bird deterrent spikes to prevent perching and fouling.
2. Clean the Debris Screen
Many rain gauges include a debris screen to prevent leaves and insects from entering the collection chamber. After a dry spell, these screens can become clogged with fine dust and pollen. Remove the screen and rinse it thoroughly with clean water. A soft brush can help dislodge stubborn particles.
If your debris screen is missing, a replacement is inexpensive and essential for keeping your gauge functioning properly:
- Rain Gauge Debris Screen — a universal-fit debris screen to keep your collection chamber clear.
3. Check the Tipping Bucket Mechanism
The tipping bucket inside your rain gauge is a precision instrument. Dust and debris can settle on the bucket surfaces, affecting its balance and calibration. You may find it use to remove the battery from your rain sensor or unplug it from the transmitter to prevent a false reading before stating. Gently clean the bucket with a soft, damp cloth — avoid using any abrasive materials or harsh chemicals that could damage the surface.
Test the mechanism by manually tipping the bucket a few times to ensure it moves freely and returns to its resting position. If the bucket feels stiff or doesn't return smoothly, a deeper clean or replacement of the internal assembly may be needed - drop us a message.
4. Inspect Mounting Hardware
Long periods of hot, dry weather can cause mounting brackets and hardware to loosen as materials expand and contract. Check that your rain gauge is securely mounted and level — an unlevel gauge will give inaccurate readings.
If your mounting hardware is corroded or missing, we carry various replacement options.
5. Clean the Exterior and Check for UV Damage
Wipe down the exterior of your rain gauge with a damp cloth to remove dust and grime. While you're doing this, check for any signs of UV damage — prolonged sun exposure can make plastic components brittle and discoloured. If you notice any cracking or warping, consider replacing the affected parts before they fail.
Spare Parts to Keep on Hand
It's always a good idea to keep a few key spare parts available so you're ready when maintenance reveals wear and tear. Here's a quick checklist of the most commonly needed items:
- Replacement funnel — the most exposed component and the most likely to need replacing
- Debris screen — inexpensive and essential for preventing blockages
- Mounting hardware — to keep your gauge secure and level
- Console/display — if your indoor display has stopped receiving data, a replacement console may be needed
Stay Prepared for the Rain
After a long dry spell, a little maintenance goes a long way. By cleaning your rain gauge, checking the tipping mechanism, and replacing any worn parts, you'll be ready to capture accurate rainfall data the moment the weather turns.
If you're unsure which spare part is right for your model, get in touch with us — we're happy to help you find the correct component for your weather station setup.
